Ram Mount 2000 Rod Holder with Flush Mount, Black RAM-ROD Combination Bulkhead/Flat Surface Base with Plunger for Spline Posts The combination bulkhead/flat surface mounting base can be installed on a flat surface such as the deck or on a vertical surface. This mounting base features a locking feature which requires the release of a plunger to remove the rod holder. Compatible with RAM post and spline rod holders and RAM wedge mount ball adapters. Material High Strength Composite Note The "U" in the part number reflects product packaged in poly bag.